package com.cn.tfl.photocropper;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.util.Log;

public class CompressImageUtils {
	
	 public static final String TAG = "ChoosePhotoUtils";
	 
	 public static void compressImageFile(CropParams cropParams, Uri originUri, Uri compressUri) {
	        Bitmap bitmap = null;
	        OutputStream out = null;
	        try {
	            final BitmapFactory.Options options = new BitmapFactory.Options();
	            options.inJustDecodeBounds = true;
	            BitmapFactory.decodeFile(originUri.getPath(), options);
	            // Calculate inSampleSize
	            int minSideLength = cropParams.compressWidth > cropParams.compressHeight
	                    ? cropParams.compressHeight : cropParams.compressWidth;
	            options.inSampleSize = computeSampleSize(options, minSideLength, cropParams.compressWidth * cropParams.compressHeight);
	            // Decode bitmap with inSampleSize set
	            options.inJustDecodeBounds = false;
	            bitmap = BitmapFactory.decodeFile(originUri.getPath(), options);
	            File compressFile = new File(compressUri.getPath());
	            if (!compressFile.exists()) {
	                boolean result = compressFile.createNewFile();
	                Log.d(TAG, "Target " + compressUri + " not exist, create a new one " + result);
	            }
	            out = new FileOutputStream(compressFile);
	            boolean result = bitmap.compress(Bitmap.CompressFormat.JPEG, cropParams.compressQuality, out);
	            Log.d(TAG, "Compress bitmap " + (result ? "succeed" : "failed"));
	        } catch (Exception e) {
	            Log.e(TAG, "compressInputStreamToOutputStream", e);
	        } finally {
	            if (bitmap != null)
	                bitmap.recycle();
	            try {
	                if (out != null)
	                    out.close();
	            } catch (IOException ignore) {
	            }
	        }
	    }

	    public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
	        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);
	        int roundedSize;
	        if (initialSize <= 8) {
	            roundedSize = 1;
	            while (roundedSize < initialSize) {
	                roundedSize <<= 1;
	            }
	        } else {
	            roundedSize = (initialSize + 7) / 8 * 8;
	        }
	        return roundedSize;
	    }

	    private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
	        double w = options.outWidth;
	        double h = options.outHeight;
	        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
	        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));
	        if (upperBound < lowerBound) {
	            // return the larger one when there is no overlapping zone.
	            return lowerBound;
	        }
	        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
	            return 1;
	        } else if (minSideLength == -1) {
	            return lowerBound;
	        } else {
	            return upperBound;
	        }
	    }

}
